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Documentation / @zerotal/core / index / withHeaders

Function: withHeaders()

withHeaders(res, headers): Response

Defined in: http/withHeaders.ts:16

Return a copy of res with the given headers added/overwritten.

A Response produced by Response.redirect() (or Response.error()) has an immutable headers guard — calling res.headers.set(...) on it throws. Middleware that decorates the downstream response (CORS, security headers, rate-limit info, …) must therefore reconstruct rather than mutate in place. new Response(body, ...) always yields a mutable guard, so the copy is safe.

Parameters

res

Response

headers

Record<string, string>

Returns

Response

Example

async handle(_, next) {
  const res = await next();
  return res ? withHeaders(res, { "X-Frame-Options": "DENY" }) : res;
}